Frequency diversity for image enhancement
Patent 4561019 Issued on December 24, 1985. Estimated Expiration Date: 
May 16, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 16, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3737799 Multiple intermediate frequency side-lobe canceller Diagnostic ultrasonography utilizing frequency spectrum analysis presented in terms of B-scan color patterns or X-Y graph displays Method and apparatus for distinguishing between minimum and non-minimum phase fades Ultrasonic imaging system with correction for velocity inhomogeneity and multipath interference using an ultrasonic imaging array Patent #: 4471785 InventorsApplicationNo. 06/494633 filed on 05/16/1983US Classes:348/163, Sonic or ultrasonic455/306, Filter in at least one path73/602With signal analyzing or mathematical processingExaminersPrimary: Britton, Howard W.Attorney, Agent or FirmInternational ClassesG01S 13/00 (20060101)G01S 13/89 (20060101) G02B 27/48 (20060101) G01S 7/10 (20060101) G01S 7/52 (20060101) G01S 7/04 (20060101) AbstractMethods for improving the availability of information derived from signals received from an object irradiated with coherent pulses of any form of radiation that exhibits a wave nature are disclosed. A method for reducing speckle derives separate component noncoherent signals from the received signals, and combines these separate noncoherent signals to form improved composite noncoherent signals. Weighting and processing of component signals can be applied as a function of time, frequency, and signal amplitude to optimize speckle reduction in all or a critical part of the signal by compensating for the range and frequency dependence of attenuation and the frequency dependence of scattering phenomena. In a method for enhancing resolution, separate component coherent signals are derived from the received signals, weighted and processed, and combined to form improved composite coherent signals; then noncoherent signals are derived from the improved composite coherent signals. In both methods, signals can be processed either in the analog or digital domains or in hybrid analog/digital domains. The apparatus for performing each method also is disclosed.Other References
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